M&G DuraVent DuraTech 5-8 User Manual
Installation Instructions
All-Fuel Chimney System
5” to 8” diameter
DuraTech
A MAJOR CAUSE OF VENT RELATED FIRES IS FAILURE
TO MAINTAIN REQUIRED CLEARANCES (AIR SPACES) TO
COMBUSTIBLE MATERIALS. IT IS OF THE UTMOST IMPORTANCE
THAT DOUBLE WALL DURATECH BE INSTALLED ONLY IN
ACCORDANCE WITH THESE INSTRUCTIONS.
NOTE:
Read through all of these instructions before
beginning your installation. Failure to install
as described in this instruction will void the
manufacturer’s warranty, and may have an
effect on your homeowner’s insurance and
UL listing status. Keep these instructions for
future reference. This booklet also contains
instructions for installing a venting system
within an existing masonry chimney, and
for installations passing through a cathedral
ceiling.
Dear Customer, Installer, or End User:
We welcome any comments regarding matters
pertaining to our DuraVent products.
We welcome any ideas, input or complaints
and I’ll make sure that someone responds
directly back to you.
Send your emails to:
president@duravent.com
If you are searching for tech support or product
information, please phone us at 800-835-4429.
Or email us at:
techsupport@duravent.com
LISTED
MH7399
ALLFUEL CHIMNEY SYSTEM, 5” TO 8” DIAMETER
For the most up-to-date installation instructions, see www.duravent.com
CONTENTS
CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PERMITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
DURATECH CHIMNEY APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
EQUIPMENT & MATERIALS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CHIMNEY DIAMETER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CHIMNEY HEIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CHIMNEY PLACEMENT. . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CHIMNEY ENCLOSURE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STOVE RECOMMENDATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STEP-BY-STEP DIRECTIONS . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . 6
CEILING SUPPORTED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
OFFSET ELBOW INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
EXTENDED ROOF BRACKET INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . .13
ROOF SUPPORTED INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
TEE-SUPPORTED INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
MASONRY FIREPLACE INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
ZERO-CLEARANCE FIREPLACE INSTALLATIONS . . . . . . . . . . . . . . . . . . . 22
CONNECTION FROM APPLIANCE TO CHIMNEY SYSTEM . . . . . . . . . . . . . 22
CHIMNEY MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DuraTech
3
CLEARANCES
Always allow at least a 2-inch clearance
between DuraTech Chimney Pipe and any
combustible materials. Never ll any required
clearance space with insulation or any other
materials. Combustible materials include
lumber, plywood, sheetrock, plaster and lath,
furniture, curtains, electrical wiring and building
insulation. Keep single wall stovepipe at least
18 inches away from combustible materials,
unless a clearance reduction system that is
acceptable to the authority having jurisdiction
is used, or the appliance to be installed is
listed and the instructions specify a different
clearance.
PERMITS
Contact your local Building Ofcial or Fire
Ofcial regarding permits, restrictions, and
installation inspections in your area.
DURATECH CHIMNEY
APPLICATIONS
DuraTech Chimney is a complete chimney
system tested and listed to UL 103 HT for the
United States, and ULC S604 in Canada. In
the U.S., DuraTech Chimney can be used with
wood stoves, replaces, reboxes, furnaces,
boilers, water heaters, stoves, ranges, or
other residential-type appliances fueled by oil,
gas, coal, or wood, that require a UL103 HT
chimney system. In Canada, DuraTech can
be used with oil & gas red appliances listed
for use with a Type A Chimney, in accordance
with ULC S604 . DuraTech is also listed for use
in Canada with some factory-built replaces;
check with your replace manufacturer.
Otherwise, DuraTech has not been approved
for use with solid fuel appliances in Canada.
DuraTech Chimney is available in 5”, 6”, 7” &
8” diameters (UL 103 HT Rated), as well as
10”, 12”, 14” & 16” diameters (UL 103 Rated).
Do not use with forced draft, positive-pressure
appliances. The DuraTech Chimney system
may have a maximum of two (2) offsets (four
elbows total) of 30° from vertical. DuraTech
Chimney is listed under UL Re-examination
Service Number MH7399.
EQUIPMENT & MATERIALS
Hammer Drill
Caulking Gun Plumb Bob
Screwdrivers Tin Snips
(Phillips & Standard)
Saber or Keyhole Saw Level
Dependable Ladder Tape Measure
Proper Gloves and Shoes Eye Protection
Materials You May Need:
500ºF RTV Silicone Sealant
8 Penny Nails
#8, 2-1/2” & 1-1/2” Wood Screws
Roong Nails
INSTALLATION NOTES
Proper planning for your DuraTech Chimney
installation will result in greater safety,
efciency, and convenience, as well as
saving time and money. You must use
only authorized DuraTech Chimney parts
to maintain a listed Chimney system (not
including the connector pipe). Do not mix
parts or try to match with other products,
or use improvised solutions. Do not install
damaged or modied parts. Table 1 lists the
authorized DuraTech Chimney components.
Practice good workmanship. Sloppy work
could jeopardize your chimney’s safety. Keep
electrical wiring and insulation away from all
chimneys and stovepipes. If you have any
questions, be sure to contact either your dealer
or DuraVent directly.
4
DuraTech Chimney Components
6”, 12”, 18”, 24”, 36”, 48” pipe
sections
Elbow with swivel Attic Insulation Shield
Tee with Tee Cap Elbow Strap
Adjustable Tee Support Bracket Adjustable Wall Strap
Chimney Cap Anchor Plate
Round Ceiling Support Box Extended Roof Bracket
Trim collars for Round
Support Boxes
Square Ceiling Support Box Chase Top Flashing
Flat Ceiling Support Box Flat Roof Flashing
Roof Support Storm Collar
Trim collar for Roof Support
Wall Thimble Base Tee and Double
Finishing Collar Firestop
Reduced Clearance
Support Box
Firestop Radiation
Shield
Adjustable Roof
Flashing
Transistion Anchor Plate
Base Tee
CAS Ceiling Support
Table 1
CHIMNEY DIAMETER
Follow the appliance manufacturer’s
instructions to determine chimney diameter
and clearances between combustible materials
and your heating appliance. Never choose
a chimney with an inside diameter smaller
than your appliance’s outlet. To calculate the
chimney’s outside diameter, add 2 inches to
the inside diameter.
3 FT MIN
ABOVE
ROOF
ATTIC
SPACE
OCCUPIED
SECOND
FLOOR
2 FT MIN ABOVE HIGHEST
POINT OF ROOF WITHIN
10 FT
10 FT
Figure 1
ATTIC
INSULATION
SHIELD
FIRESTOP
RADIATION
SHIELD
(INSIDE)
ENCLOSURE
MUST HAVE 2
INCHES OF
CLEARANCE
BETWEEN
CHIMNEY AND
WALL
CHIMNEY HEIGHT
The National Fire Protection Association
Standard #211 states: “Chimneys shall extend
at least three feet above the highest point
where it passes through the roof of a building,
and at least two feet higher than any portion
of a building within ten feet.” (Fig 1) DuraTech
Chimney may be installed up to 60 feet high. If
the chimney extends more than 5 feet above
FIRST
FLOOR
SUPPORT
BOX
Figure 2
the roof, an Extended Roof Bracket must be
used (see page 12). Due to the overlap of the
joints, subtract 1-1/4 inches from each Chimney
Section’s height to calculate installed height.
5
CHIMNEY PLACEMENT
When deciding the location of your chimney,
try to avoid modications to roof beams and
other structural components of the building.
CHIMNEY ENCLOSURE REQUIREMENTS
Through Rooms: Interior chimneys shall be
enclosed where they extend through closets,
storage areas, occupied spaces, or anyplace
where the surface of the chimney could be
contacted by persons or combustible materials.
Maintain at least a 2-inch air space between
the outer wall of the chimney and the enclosure
(Fig 2).
Multi-Story: Consult local building codes for
requirements in your area. In the U.S., the
National Fire Protection Association Standard
#211 states: “Factory-built chimneys that
pass through oors of buildings requiring the
protection of vertical openings shall be enclosed
with approved walls having a re resistance
rating of not less than one hour when such
chimneys are located in a building less than
4 stories in height, and not less than 2 hours
when such chimneys are located in a building
more than 4 stories in height.” In Canada,
except in single-family and two-family dwellings,
chimneys which extend through another story
must have an enclosure with a re resistance
rating equal to or greater than that of the oor or
roof assembly through which they pass.
Cold Climates: In cold climates, chimneys
mounted on an outside wall should be
enclosed in a chase. Exterior chases reduce
condensation and creosote formation, and
enhance draft. Include an access door by the
Tee Cap for chimney cleaning (Refer to Fig 23).
6
STOVE RECOMMENDATIONS
Follow the stove manufacturer’s instructions.
The requirements stated below pertain to
all stoves or other appliances installed with
DuraTech Chimney systems.
Choice: Choose an appliance that is listed by
a recognized testing laboratory, is appropriate
for your needs, and is not larger than required.
Installation: Once the chimney system is in
place, install the stovepipe to connect the
appliance to the chimney as described in the
appliance manufacturer’s instructions. Be sure
to maintain all required clearances.
Flues: Connect only one solid fuel appliance
per chimney.
Operation: Follow the appliance
manufacturer’s instructions for maximum
efciency and safety. Overring can damage
the appliance, stovepipe and chimney.
Fuels: Do not burn driftwood, plastic, or
chemically treated wood such as railroad
ties. They are corrosive to your appliance,
stovepipe and chimney. Follow the appliance
manufacturer’s instructions and safety manual
in regards to fuels. Not all appliances are
equipped to burn coal. Coal with a low sulfur
content will reduce the possibility of corrosion.
Mobile Homes: Please read the appliance
manufacturer’s instructions and safety manual
carefully. Not all appliances are listed for use
in mobile homes.
STEP-BY-STEP DIRECTIONS
There are ve general types of DuraTech
Chimney installations:
1.Ceiling-supported
2.Roof-supported
3.Tee-supported (through-the-wall)
4.Masonry Fireplace
5.Zero-Clearance Fireplace
Review the step-by-step directions before
beginning your installation.
CEILING SUPPORTED
1. Place Appliance: Position the appliance
according to the manufacturer’s instructions.
The ue outlet collar should be placed
between the rafters or joists above, if possible.
2. Frame Support Opening: Drop a plumb
bob to the center of the appliance’s ue outlet
and mark this center point on the ceiling. Refer
to Table 2 for specic framing and clearance
dimensions. Mark appropriate cutting lines
around the center point. Cut a square hole in
the ceiling for the Support Box. Frame a level,
square opening centered over the hole which
you have cut. (Figures 3 and 4).
3. Install Support Box: For installation into
a at ceiling, there is the option of the Round
Support Box, the Flat Ceiling Support Box,
the Square Ceiling Support Box , Reduced
Clearance Support Box , or the CAS Ceiling
Support. The CAS Ceiling Support is only
used when installing the CAS system. Refer
to the DuraTech CAS Installation Instructions
for directions on how to install the remainder
of the Combustion Air System.. The Flat
Ceiling Support Box is primarily used for
Oil Appliances and comes unpainted. For
the Square Ceiling Support Box, Reduced
Clearance Support Box, and the CAS Ceiling
MINIMUM OF 3
INCHES BELOW
FINISHED CEILING
18 INCHES
MINIMUM FOR
SINGLE WALL
STOVEPIPE
ROUND SUPPORT
BOX
JOISTS & FRAMING
3 INCH MIN REQUIRED
BELOW FINISHED CEILING
CHIMNEY CAP
Figure 3
STORM
COLLAR
ROUND SUPPORT BOX WITH
SQUARE TRIM COLLAR
ADJUSTABLE FLASHING
CHIMNEY SECTIONS
ATTIC INSULATION SHIELD
FRAMED OPENING
ROUND TRIM COLLAR
3 INCH MIN BELOW
FINISHED CEILING
ROUND SUPPORT BOX WITH
ROUND TRIM COLLAR
Figure 4 Figure 5
7
SQUARE CEILING
SUPPORT BOX WITH
TRIM FRAME
IN PLACE
WOOD SCREWS ARE
REQUIRED
ROUND CEILING
SUPPORT WITH TRIM
IN PLACE
MIN OF 2
INCHES
BELOW
FINISHED
CEILING
WOOD SCREWS ARE
REQUIRED
Figure 6
CAP
STORM
COLLAR
2 INCH MIN
CLEARANCE
TO INSIDE OF
ENCLOSURE
FRAMED
ENCLOSURE
MIN OF 3
INCHES BELOW
FINISHEDCEILING
18 INCH MIN FOR
SINGLE WALL
STOVEPIPE
ADJUSTABLE
FLASHING
CHIMNEY
SECTION
ATTIC
INSULATION
SHIELD
FIRESTOP
RADIATION
SHIELD
CHIMNEY
SECTION
Figure 7
Support, refer to the Square ceiling installation
below. The Round Ceiling Support Box has
the option of a square or round Trim Collar
available (Fig 5). The bottom of the Round
Support Box must extend at least 3 inches
below the nished ceiling. Level the Support
Box and secure it to the framing using at least
three 8-penny nails per side (min. of 12 total).
Alternatively, you may use 1-1/2” #8 wood
screws (min. of 12 total), instead of nails.
Next, secure the Trim Collar (round or square)
to the framing members using the (4) 1” long,
round-head wood screws provided (Fig 6).
For installation into a cathedral ceiling, you
must use the Square Ceiling Support Box or
Reduced Clearance Support Box (or the CAS
Ceiling Support if installing the CAS system)
and the two-piece Trim. The bottom of the
square portion of the Support Box must be a
minimum of 2-inches lower (round portion is
an additional 3 inches lower) than the nished
ceiling at the lowest side of the penetration
(Fig 5 & 6). Level the Support Box and
secure it to the framing using at least three (3)
8-penny nails per side (minimum of 12 nails
total), or a minimum of (3) #8, 1-1/2” wood
screws. Adjust the overlapping “U-shaped”
Trim pieces so they cover the Support Box,
and secure them to the framing members
using the (6) 1-1/4” long, round head wood
screws provided (see Fig 6).
4. Frame Openings: Frame openings in
each ceiling or oor above the Support Box
(Fig 7). These openings are to hold the
Firestop Radiation Shield and Attic Insulation
Shield. Locate each opening by dropping a
plumb bob to the four corners of the opening
below. Maintain the framing dimensions as
specied in Table 2.
Warning: other than the framing for the
Reduced Clearance Support Box, any
combustible materials around the chimney
must still meet the minimum 2” clearance
requirement. If Elbows must be used to
avoid an obstruction, refer to the Offset Elbow
Installation section.
5. Cut Roof Opening: Cut an opening in the
roof directly above the opening below, and
at least 4 inches larger than the chimney’s
outside diameter to provide at least a
2-inch clearance all around the chimney.
The chimney must be centered within this
8
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